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Depends a bit on which year you're talking about. Way back 10-spd used to mean two chainwheels at the front and 5 sprockets at the rear, making it a total of 10 speed. Today 10 speed usually means that you have 10 sprockets at the rear, and then 2 or 3 chainwheels at the front, making it a total of 20 or 30 gears. So if you have an old 10-spd(2x5) then the less old 21(3x7) will offer a greater number of different gear ratios. But if you're comparing a modern 10 speed(2-3x10)with a somewhat old 21 speed(3x7) then the 10 speed is likely to be a newer and better bike.
Wiki User
∙ 14y ago
Wiki User
∙ 6y agoBecause humans, like engines, work best only in a range or speeds.
Gears allows you to keep pedalling at a certain level of effort and pace regardless if you're heading uphill, on the flat, or downhill. This works by trading strength for speed or the other way around.
Wiki User
∙ 14y agoWith more gears to choose from you can keep turning the pedals at a steady rate and effort level regardless of if the road is going uphill or downhill. Makes riding more efficient.
Wiki User
∙ 13y agoIt is because there are more speeds that the gears are split into- therefore you have more options. The third gear on the bike pobably feels similar to the 10th on the other.
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